She has just overseen a daring new campaign to promote awareness of cervical cancer.

And Poppy Delevingne certainly drew gasps again as she hit the town in London on Monday evening.

The stunning model-turned-actress, 31, turned heads by slipping into a provocative black lace number for the Conde Nast Traveller 20th anniversary bash at Vogue House, which was sponsored by Perrier-Jouët Champagne.

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Racy lacy! Poppy Delevingne certainly drew gasps again as she hit the town in London on Monday evening

Showing off her fabulous figure - and her retro lingerie - the star smouldered as she arrived on the arm on her husband, James Cook.

With her daring dress commanding all the attention, Poppy kept the rest of look simple, adding diamond drop earrings and a pair of embroidered heels.

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Also at the bash was socialite Laura Bailey, who cosied up to Poppy while demanding attention herself in a vintage scarlet dress.

The glitzy guests mingled in the historic building as they sipped Grey Goose cocktails.

Poppy had hired her supermodel sister Cara to promote her Lady Garden Campaign last week.

Head turner: The stunning model-turned-actress, 31, turned heads by slipping into a provocative black lace number for the Conde Nast Traveller 20th anniversary bash at Vogue House

Date night! Showing off her fabulous figure - and her retro lingerie - the star smouldered as she arrived on the arm on her husband, James Cook

Strike a pose: With her daring dress commanding all the attention, Poppy kept the rest of look simple, adding diamond drop earrings and a pair of embroidered heels

She's a star: The beauty sat seductively next to balloons as the bash got underway

Blondes have more fun! Also at the bash was socialite Laura Bailey, who cosied up to Poppy while demanding attention herself in a vintage scarlet dress

Intimate: Poppy had hired her supermodel sister Cara to promote her Lady Garden Campaign last week to raise awareness of cervical cancer

The drive, featured in GQ magazine, showed Cara stood in just white T-shirt with an arty flower design protecting her modesty, with the actress saying: 'There’s a taboo surrounding vaginas that I want to get rid of…. It shouldn’t have to be so serious.'

Continuing, she said: 'It can be fun and easy to talk about. It should be.'

Speaking to the publication about the campaign, Cara explained that her sister Chloe co-founded the campaign after finding pre-cancerous cells in her cervix herself - but even if her sibling weren't involved, she would still want to be a part of it.

'It's fun, but has a really important message which is very on point for me - that girls and women should be liberated from the social constraints which force us to try and fit into a mould.

She explained that she wanted women to be able to 'speak openly and bravely about vaginas and all the gynaecological areas of a woman's body'.

'There’s a taboo surrounding vaginas that I want to get rid of…. it shouldn’t have to be so serious' The campaign, featured in GQ magazine, is an important idea for Cara and Poppy, as they feel that everyone should be able to speak openly

'It's a human right to know our bodies and we are so poorly educated. I hope by supporting the Lady Garden Campaign I will encourage women to be brave, get to know their own bodies and speak up!'

The Suicide Squad actress continued, saying that the campaign was designed to help men also talk about the issue of cervical cancer.

'Particularly in the UK, there is so much shame about the areas of the body that are considered to be sexual. These areas are also functioning organs and if we start treating them as such we can all help each other to live more open and connected lives.'

Famous faces: Naomi Campbell also took part in the campaign, looking every inch the supermodel as she posed with a lily strategically placed

Blooming lovely: Make Up Artist to the stars Charlotte Tilbury also took part in the campaign

Cara has been busy breaking other boundaries too; speaking to Net-a-Porter's The Edit this week about her struggles with mental health.

She describes how she was often mistaken for a boy as a teenager, explaining: 'If I wore the clothes that I liked, with my short hair, everyone would think that I was a boy. I hated it. Even though I looked like a boy and acted like a boy, I wasn’t a boy.'

Describing her battle with depression, Cara said: 'I hated myself for being depressed, I hated feeling depressed, I hated feeling. I was very good at disassociating from emotion completely.'